Saturday 10 June 2017

mca5043 smu mca spring 2017 (jul/aug 2017 exam) Vth sem assignment

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PROGRAM-MCA(Revised Fall 2012)
SEMESTER-V
SUBJECT CODE & NAME-MCA5043– Data Warehousing and Data Mining
CREDIT-4
BK ID-B1633
MAX. MARKS-60
1. Explain the Functionalities and advantages of Data Warehouses. 5+5
Answer.
Functionalities and advantages of Data Warehouses
Functionalities
A data warehouse functions as a repository for all the data held by an organisation. The main functions are to reduce cost of data storage, facilitate data mining, and facilitate ability to back up data at an organisational level. A data warehouse is the main repository of an organization's historical data, its corporate memory.  A data warehouse is a logical

2 Explain the Top-Down and Bottom-up Data Warehouse development Methodologies.

Answer: Despite the fact that Data Warehouses can be designed in a number of different ways, they all share a number of important characteristics. Most Data Warehouses are Subject Oriented. This means that the information that is in the Data Warehouse is

3. Describe about Hyper Cube and Multicube 5+5
Answer.
Hyper Cube and Multicube
Multidimensional databases can present their data to an application using two types of cubes: hypercubes and multicubes.

4. List and explain the Strategies for data reduction. 5*2
Answer.
Strategies for data reduction
Data reduction: Obtain a reduced representation of the data set that is much smaller in volume but yet produces the same (or almost the same) analytical results.
Why data reduction?


5. Describe K-means method for clustering. List its advantages and drawbacks. 5+5
Answer.
K-means method for clustering
k-means clustering is a method of vector quantization, originally from signal processing, that is popular for cluster

6. Describe about Multilevel Databases and Web Query Systems 5+5
Answer.
Multilevel Databases and Web Query Systems
Multilevel Databases
A multilevel database system (MDBMS) supports the application of a multilevel policy for regulating access to the database objects. In this approach at the bottom level database the semi structured data is stored in web repositories as hyper text .The 

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